热镀铝锌带钢表面缺陷形成机理及工艺优化

doi:10.13228/j.boyuan.issn0449-749x.20220595

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Abstract In order to research the formation mechanism of zinc slag and zinc ash defects on the surface of hot-dip aluminized zinc strip steel,as well as,improve the surface quality of strip steel through process optimization,the fluctuation of strip steel specifications and process parameters was initially determined in the hot-dip galvanizing process. Which was the main factor for the generation of zinc slag in the zinc pot and zinc ash in the furnace nose. The hot-dipping mechanism,equipment parameters and production process were combined,in the further,analyzed the effect of both defects on the running state of the submerged roll system. and the surface's type of strip steel on the different positions in the hot-dip process section. Such as transfer slag,slag scratches,spot slag and zinc ash leakage plating. At the same time,the SEM (Scanning Electron Microscope) and EDS (Energy Dispersive Spectrometer) experimental methods were used to observation of defect morphology and ensure the composition about zinc dross and zinc ash defects,which probably was zinc-oxide,iron-aluminum and iron-zinc compounds. Besides,the formation mechanism of zinc dross and zinc ash was analyzed at the help of combining with hot dip technology and equipment. The results showed that temperature fluctuation was the main factor of zinc dross and zinc ash defects. It was verified that the fluctuation of the strip temperature at the out of cooling furnace and entering zinc pot as the mechanism of the defects was correctness in the hot-dip galvanizing unit. Meanwhile,the submerged roll system,strip steel specifications,thermal process parameters and temperature influencing factors were considered when the temperature field models of zinc nose and zinc pot were established. Based on theoretical research and practice,combined with the capacity of the continuous cooling furnace,the strip temperature was optimized which effectively reduces the amount of zinc slag and zinc ash defects on the strip surface. The results laid the foundation for further treatment of zinc slag and zinc ash defects from the view of production process. It also provided a temperature control model for the upgrading of zinc pot and zinc nose equipment in the hot-dip galvanizing unit.

Key words： hot dip galvanized surface quality zinc ash zinc dross temperature

Received: 16 September 2022

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	ZHANG Wen-jun
	LIU Ge-fei
	WANG Xiao-jian
	QIAN Sheng
	ZHANG Ji
	BAI Zhen-hua

Cite this article:

ZHANG Wen-jun,LIU Ge-fei,WANG Xiao-jian等. Formation mechanism and process optimization of surface defects on hot-dip Al-Zn strip steel[J]. Iron and Steel, 2023, 58(4): 87-95.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220595 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I4/87

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